Ballot that is invalid and is thus not included in the final vote count.
1
Any other form of marking will lead to a spoilt vote.
2
The IEC has prepared for this, and explained to us what constitutes a spoilt vote.
3
Any attempt to circle or "fill in" a box is a spoilt vote.
4
It's not just a handful of voters, either: Thousands of people register a " spoilt vote" in every national election, with varying degrees of purpose.